<template>
  <div class="component-upload-image">
    <el-upload multiple :action="uploadImgUrl" list-type="picture-card" :on-change="handleChange"
      :on-success="handleUploadSuccess" :before-upload="handleBeforeUpload" :limit="limit" :on-error="handleUploadError"
      :on-exceed="handleExceed" name="file" ref="imageUpload" :on-remove="handleRemove" :show-file-list="true"
      :headers="headers" :file-list="fileList" :on-preview="handlePictureCardPreview"
      :class="{ hide: fileList.length >= limit, isShowCheckIMg: isShowCheckIMg }" :disabled="disabled">
      <el-icon class="avatar-uploader-icon">
        <plus />
      </el-icon>
      <template #file="{ file }">
        <div style="width:100%;height:100%;overflow: hidden;">
          <img class="el-upload-list__item-thumbnail" :src="file.url" alt="" />
          <span class="el-upload-list__item-actions">
            <span class="el-upload-list__item-preview" @click="handlePictureCardPreview(file)">
              <el-icon><zoom-in /></el-icon>
            </span>
            <span v-if="!disabled" class="el-upload-list__item-delete" @click="handleRemove(file)">
              <el-icon>
                <Delete />
              </el-icon>
            </span>
          </span>
        </div>
        <!-- <el-checkbox-group v-if="isShowCheckIMg" v-model="checkedImgList" @change="checkedPic" :key="file.attachId">
          <el-checkbox :label="file.attachId" size="large">{{''}}</el-checkbox>
        </el-checkbox-group> -->
        <el-checkbox v-if="isShowCheckIMg" v-model="file.checked" :disabled="disabled" @change="e => checkedPic(e, file.attachId)" size="large">{{''}}</el-checkbox>

      </template>
     
    </el-upload>
    <!-- 上传提示 -->
    <div class="el-upload__tip" v-if="showTip">
      请上传
      <template v-if="fileSize">
        大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
      </template>
      <template v-if="fileType">
        格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
      </template>
      的文件
    </div>

    <el-dialog v-model="dialogVisible" title="预览" width="800px" append-to-body>
      <!--<img :src="dialogImageUrl" style="display: block; max-width: 100%; margin: 0 auto" />-->
      <!--开启预览大图的功能-->
      <el-image
          style="display: block; max-width: 100%; margin: 0 auto"
          :src="dialogImageUrl"
          :preview-src-list="srcList"
      />
    </el-dialog>
  </div>
</template>

<script setup>
import { getToken } from "@/utils/auth";
import { upLoadFile, downLoadFile, deleteFile } from "@/api/system/attachFile";

const props = defineProps({
  modelValue: [String, Object, Array],
  // 图片数量限制
  limit: {
    type: Number,
    default: 5,
  },
  // 大小限制(MB)
  fileSize: {
    type: Number,
    default: 5,
  },
  // 文件类型, 例如['png', 'jpg', 'jpeg']
  fileType: {
    type: Array,
    default: () => ["png", "jpg", "jpeg"],
  },
  // 是否显示提示
  isShowTip: {
    type: Boolean,
    default: true
  },
  disabled: {
    type: Boolean,
    default: false
  },
  isShowCheckIMg: {
    type: Boolean,
    default: false
  },
  checkedPicList: {
    type: [Array, String],
    default: () => []
  },
  // checkedPicList: {
  //   type: String,
  //   default: ''
  // }
  downloadUrl: {
    type: String,
    default: 'downLoadFile'
  }
});

const { proxy } = getCurrentInstance();
const emit = defineEmits();
const number = ref(0);
const uploadList = ref([]);
const dialogImageUrl = ref("");
const srcList = ref([]);
const dialogVisible = ref(false);
const baseUrl = import.meta.env.VITE_APP_BASE_API;
const uploadImgUrl = ref(import.meta.env.VITE_APP_BASE_API + "/attachment/uploadFile"); // 上传的图片服务器地址
const headers = ref({ token: "token " + getToken() });
const fileList = ref([]);
const showTip = computed(
  () => props.isShowTip && (props.fileType || props.fileSize)
);
let checkedImgList = ref([])

onMounted(() => {
  // checkedImgList.value = props.checkedPicList || [];
})
watch(() => props.checkedPicList, val => {
  checkedImgList.value = props.checkedPicList || [];
  if(Array.isArray(props.modelValue) && props.modelValue.length > 0){
    props.modelValue.forEach(item => {
      if(checkedImgList.value.includes(item.attachId)){
        item.checked = true
      }else{
        item.checked = false
      }
    })
  }
}, { deep: true, immediate: true })
watch(() => props.modelValue, val => {
  if (val) {
    // 首先将值转为数组
    const list = Array.isArray(val) ? val : props.modelValue.split(",");
    // 然后将数组转为对象数组
    fileList.value = list.map(item => {
      if (typeof item === "string") {
        if (item.indexOf(baseUrl) === -1) {
          item = { name: baseUrl + item, url: baseUrl + item };
        } else {
          item = { name: item, url: item };
        }
      }
      item.name = item.attachName;
      let downloadSrc = import.meta.env.VITE_APP_BASE_API + "/attachment/" + props.downloadUrl
      item.url = downloadSrc + "?attachId=" + encodeURIComponent(item.attachId)
      return item;
    });
  } else {
    fileList.value = [];
    return [];
  }
}, { deep: true, immediate: true });

// 删除图片
function handleRemove(file) {
  let newFileList = props.modelValue.filter(item => file.attachId != item.attachId)
  emit("update:modelValue", newFileList)
  //emit("update:modelValue", listToString(fileList.value));\
  // deleteFile(file.attachId).then(res => {
  // 	    //console.log(res)
  // 	if (res.code==200) {
  //       proxy.$modal.msgSuccess("删除图片成功");

  //   }else{
  //       proxy.$modal.msgError("删除图片失败");

  //   }
  // });
}

function handleChange(file, fileList) {
  fileList.value = fileList;
}

// 上传成功回调
function handleUploadSuccess(res) {
  uploadList.value.push({ attachId: res.data[0].attachId, name: res.data[0].attachName, url: import.meta.env.VITE_APP_BASE_API + "/attachment/downLoadFile?attachId=" + encodeURIComponent(res.data[0].attachId) });
  if (uploadList.value.length === number.value) {
    fileList.value = fileList.value.filter(f => f.attachId !== undefined).concat(uploadList.value);
    uploadList.value = [];
    number.value = 0;
    //emit("update:modelValue", listToString(fileList.value));
    proxy.$modal.closeLoading();
    proxy.$modal.msgSuccess("上传图片成功");
    emit('uploadSuccess', fileList.value)
    //proxy.$refs.imageUpload.clearValidate();
  }
}

// 上传前loading加载
function handleBeforeUpload(file) {
  let isImg = false;
  if (props.fileType.length) {
    let fileExtension = "";
    if (file.name.lastIndexOf(".") > -1) {
      fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
    }
    isImg = props.fileType.some(type => {
      if (file.type.indexOf(type) > -1) return true;
      if (fileExtension && fileExtension.indexOf(type) > -1) return true;
      return false;
    });
  } else {
    isImg = file.type.indexOf("image") > -1;
  }
  if (!isImg) {
    proxy.$modal.msgError(
      `文件格式不正确, 请上传${props.fileType.join("/")}图片格式文件!`
    );
    return false;
  }
  if (props.fileSize) {
    const isLt = file.size / 1024 / 1024 < props.fileSize;
    if (!isLt) {
      proxy.$modal.msgError(`上传图片大小不能超过 ${props.fileSize} MB!`);
      return false;
    }
  }
  proxy.$modal.loading("正在上传图片，请稍候...");
  number.value++;
}

// 文件个数超出
function handleExceed() {
  proxy.$modal.msgError(`上传文件数量不能超过 ${props.limit} 个!`);
}

// 上传失败
function handleUploadError() {
  proxy.$modal.msgError("上传图片失败");
  proxy.$modal.closeLoading();
}

// 预览
function handlePictureCardPreview(file) {
  dialogImageUrl.value = file.url;
  dialogVisible.value = true;
  srcList.value = [file.url];
}

// 对象转成指定字符串分隔
function listToString(list, separator) {
  let strs = "";
  separator = separator || ",";
  for (let i in list) {
    if (undefined !== list[i].url && list[i].url.indexOf("blob:") !== 0) {
      strs += list[i].url.replace(baseUrl, "") + separator;
    }
  }
  return strs != "" ? strs.substr(0, strs.length - 1) : "";
}

function checkedPic(val, id){
  // checkedImgList = val
  if(val){
    checkedImgList.value.push(id)
  }else{
    checkedImgList.value = checkedImgList.value.filter(item => item != id)
  }
}
defineExpose({
  fileList,
  checkedImgList
});
</script>

<style lang="scss">
.el-upload-list__item.is-success{
  overflow: unset;
  .el-checkbox{
    position: absolute;
    bottom: -35px;
    left: 50%;
    transform: translateX(-50%);
  }
}
.isShowCheckIMg{
  .el-upload-list__item{
    margin-bottom: 30px;
  }
}
.hide{
  .el-upload--picture-card{
    display: none;
  }
}
</style>
